[system][bt][gd] fix -Wreorder-init-list

C++20 will require members in a designated initializer to be in order
unlike C99.

Bug: 139945549
Test: mm
Change-Id: I4ed1a2c2865cfa26b45db970202340ae582ba78d
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>